fix(ClipboardIcon): Replace ClipboardIcon with RhUiClipboardFillIcon

[rebeccaalpert]

What:
This is one piece of #12400. Breaking it up by icon so it is easier to review.

Additional issues:

Summary by CodeRabbit

• Documentation
  • Updated clipboard icons in Menu, TreeView, and custom menu examples across component documentation and demo applications to use the latest icon variant.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: a93d7297-ac46-456e-9e76-c6d5d8d25960

📥 Commits

Reviewing files that changed from the base of the PR and between 7b315ab and f6a0c83.

📒 Files selected for processing (8)

• packages/react-core/src/components/Menu/examples/Menu.md
• packages/react-core/src/components/Menu/examples/MenuWithActions.tsx
• packages/react-core/src/components/Menu/examples/MenuWithFavorites.tsx
• packages/react-core/src/components/TreeView/examples/TreeView.md
• packages/react-core/src/components/TreeView/examples/TreeViewWithActionItems.tsx
• packages/react-core/src/demos/CustomMenus/CustomMenus.md
• packages/react-core/src/demos/CustomMenus/examples/ActionsMenuDemo.tsx
• packages/react-integration/demo-app-ts/src/components/demos/MenuDemo/MenuDemo.tsx

Walkthrough

This PR updates clipboard icon imports and usage across Menu, TreeView, CustomMenus, and MenuDemo examples. All instances of ClipboardIcon are replaced with RhUiClipboardFillIcon from @patternfly/react-icons in import statements and component renderings.

Changes

Clipboard Icon Standardization

Layer / File(s)	Summary
Menu component examples icon updates packages/react-core/src/components/Menu/examples/Menu.md, MenuWithActions.tsx, MenuWithFavorites.tsx	Menu documentation and example components update icon imports and rendered actions to use RhUiClipboardFillIcon instead of ClipboardIcon.
TreeView component examples icon updates packages/react-core/src/components/TreeView/examples/TreeView.md, TreeViewWithActionItems.tsx	TreeView documentation and action item example updates icon imports and button rendering to RhUiClipboardFillIcon.
CustomMenus demo icon updates packages/react-core/src/demos/CustomMenus/CustomMenus.md, examples/ActionsMenuDemo.tsx	CustomMenus documentation and demo component update icon imports and action icon usage to RhUiClipboardFillIcon.
MenuDemo integration demo icon updates packages/react-integration/demo-app-ts/src/components/demos/MenuDemo/MenuDemo.tsx	MenuDemo app updates import and replaces clipboard icon in both "Menu with Actions" and "Menu with Favorites" menu item definitions.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Suggested labels

Needs design review

Suggested reviewers

• nicolethoen
• kmcfaul
• thatblindgeye

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically describes the main change: replacing ClipboardIcon with RhUiClipboardFillIcon across multiple files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[patternfly-build]

Preview: https://pf-react-pr-12455.surge.sh

A11y report: https://pf-react-pr-12455-a11y.surge.sh